Abu Nasr Qara Yusuf ibn Mohammad Barani was the ruler of the Qara Qoyunlu dynasty from c.1388 to 1420, although his reign was interrupted by Tamerlane's invasion (1400–1405). He was the son of Qara Mahammad Töremish, a brother-in-law to Ahmad Jalayir.

The Qara Qoyunlu or Kara Koyunlu, also known as the Black Sheep Turkomans, were a culturally Persianate, Muslim Turkoman monarchy that ruled over the territory comprising present-day Azerbaijan, Armenia, northwestern Iran, eastern Turkey, and northeastern Iraq from about 1374 to 1468.